Fix compiler warning in http method code

src/app-layer-htp.c

@@ -278,7 +278,7 @@ void RegisterHTPParsers(void)
 }
 
 /**
- * \brief Returns the main HTTP transaction
+ * \brief Returns the main (first) HTTP transaction
  *
  * \param htp_state HTP library state
  * \returns Main HTP transation

src/app-layer-htp.h

@@ -33,6 +33,7 @@ void RegisterHTPParsers(void);
 void HTPParserRegisterTests(void);
 void HTPAtExitPrintStats(void);
 void HTPFreeConfig(void);
+htp_tx_t *HTPTransactionMain(const HtpState *);
 
 #endif	/* __APP_LAYER_HTP_H__ */